webpack tutorial is broken

I followed this tutorial, it is not working when I try to add a css file

cat entry.js

require("!style!css!./style.css");
document.write(require('./content.js'));

webpack_tutorial$ webpack ./entry.js bundle.js 
Hash: 6975b28bf0ad8a1c7ddd
Version: webpack 1.9.10
Time: 42ms
    Asset     Size  Chunks             Chunk Names
bundle.js  1.74 kB       0  [emitted]  main
   [0] ./entry.js 76 bytes {0} [built] [1 error]
   [1] ./content.js 45 bytes {0} [built]

ERROR in ./entry.js
Module not found: Error: Cannot resolve module 'style' in /Users/hongbozhang/git/react.git/code/webpack_tutorial
 @ ./entry.js 1:1-34